Hollow tubular sulfur-doped carbon nitride/graphite-phase carbon nitride homojunction photocatalyst, and preparation method and application thereof

A graphite phase carbon nitride and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of fast photogenerated electron-hole recombination, low light utilization efficiency, poor photocatalytic performance, etc. , The effect of accelerating the separation efficiency

Pending Publication Date: 2020-05-22

湖南大隆环境科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

However, in previous studies, the photocatalysts used for photocatalytic degradation still have the following problems: low light utilization efficiency, fast photogenerated electron-hole recombination, poor photocatalytic performance, and poor stability. Greatly limit the wide application of photocatalytic degradation

However, the existing carbon nitride-based heterojunction photocatalytic materials still have problems such as weak light absorption ability and slow photogenerated electron-hole separation rate, which limit the photocatalytic performance of the material.

Therefore, how to comprehensive...

Method used

The result in comprehensive Fig. 1~10 can know that hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homogeneous junction photocatalyst of the present invention is skeleton with solid tubular melamine and thiocyanate compound 1. Modified urea on its surface is prepared by calcination. It has a more uniform and complete hollow tubular structure compared with the prior art, and its photoe...

Abstract

The invention discloses a hollow tubular sulfur-doped carbon nitride/graphite-phase carbon nitride homojunction photocatalyst, and a preparation method and application thereof. The photocatalyst takeshollow tubular sulfur-doped carbon nitride as a carrier; graphite-phase carbon nitride is loaded on the hollow tubular sulfur-doped carbon nitride; and the hollow tubular sulfur-doped carbon nitrideand the graphite-phase carbon nitride form a homojunction. The preparation method comprises the following steps: mixing and stirring melamine and trithiocyanuric acid, carrying out a hydrothermal reaction to obtain a solid tubular melamine/trithiocyanuric acid compound, modifying the surface of the solid tubular melamine/trithiocyanuric acid compound with urea, and carrying out calcining to obtainthe product. The hollow tubular sulfur-doped carbon nitride/graphite-phase carbon nitride homojunction photocatalyst can efficiently degrade tetracycline hydrochloride or tetracycline-containing wastewater with a pH value of 2-11, and has the advantages of high light absorption capacity, low photo-induced electron-hole recombination rate, good photocatalytic performance, good stability, applicability to a wide pH scope and the like.

Application Domain

Physical/chemical process catalystsWater/sewage treatment by irradiation +3

Technology Topic

PolythiocyanogenPhoto catalysis +9

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Examples

Experimental program(7)
Comparison scheme(2)

Example Embodiment

[0044] Example 1

[0045] A hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst of the present invention uses the hollow tubular sulfur-doped carbon nitride as a carrier, and the hollow tubular sulfur-doped carbon nitride is loaded with a graphite phase Carbon nitride, hollow tubular sulfur-doped carbon nitride and graphite phase carbon nitride form a homojunction. The homogeneous junction photocatalyst has a good response and removal effect to tetracycline hydrochloride or tetracycline hydrochloride in wastewater with a pH value of 2-11.

[0046] The preparation method of the hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst in this embodiment includes the following steps:

[0047] (1) Add 1.01 g of melamine (8 mmol) and 1.41 g of thiocyanuric acid (8 mmol) to 80 mL of 50% ethanol solution and mix, and stir at 30°C and 600 rpm magnetically for 4 hours to perform preliminary self-examination Assemble to obtain a mixed solution of yellow melamine and thiocyanuric acid.

[0048] (2) Transfer the mixed solution of melamine and thiocyanuric acid obtained above to an autoclave, keep it at 100°C for 6 hours for hydrothermal reaction, after the reaction, filter and dry at 80°C, and grind to obtain solid tubular melamine /Trimer thiocyanate compound, denoted as CN·S.

[0049] (3) Add 1.21 g of the melamine/melamine thiocyanate compound obtained in step (2) to 80 mL of a 50% ethanol solution, and magnetically stir at 600 rpm/min for 30 min at 30° C., and the dispersion is uniform. Then 0.75g of urea was added and stirring was continued for 4h. The mixture was filtered, washed with water and dried at 80°C. After grinding, it was transferred to a tube furnace. In a nitrogen atmosphere, the temperature was raised to 550°C at a rate of 2.3°C/min and maintained for 4h to obtain a hollow tubular sulfur-doped nitridation. Carbon/graphite phase carbon nitride homogenous junction photocatalyst, denoted as SCN-CN-1.

Example Embodiment

[0050] Example 2

[0051] A hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst of the present invention uses the hollow tubular sulfur-doped carbon nitride as a carrier, and the hollow tubular sulfur-doped carbon nitride is loaded with a graphite phase Carbon nitride, hollow tubular sulfur-doped carbon nitride and graphite phase carbon nitride form a homogeneous junction. The homogeneous junction photocatalyst has a good response and removal effect to tetracycline hydrochloride or tetracycline hydrochloride in wastewater with a pH value of 2-11.

[0052] The preparation method of the hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst in this embodiment is basically the same as that of embodiment 1, except that: in this embodiment, in step (3) The amount of urea added is 0.94g.

[0053] The hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst prepared in this example is denoted as SCN-CN-2.

Example Embodiment

[0054] Example 3

[0055] The hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homogeneous junction photocatalyst of the present invention uses the hollow tubular sulfur-doped carbon nitride as a carrier, and the hollow tubular sulfur-doped carbon nitride is loaded with a graphite phase Carbon nitride, hollow tubular sulfur-doped carbon nitride and graphite phase carbon nitride form a homojunction. The homogeneous junction photocatalyst has a good response and removal effect to tetracycline hydrochloride or tetracycline hydrochloride in wastewater with a pH value of 2-11.

[0056] The preparation method of the hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst in this embodiment is basically the same as that of embodiment 1, except that: in this embodiment, in step (3) The amount of urea added was 1.17g.

[0057] The hollow tubular sulfur-doped carbon nitride/graphite phase carbon nitride homojunction photocatalyst prepared in this example is denoted as SCN-CN-3.

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Hollow tubular sulfur-doped carbon nitride/graphite-phase carbon nitride homojunction photocatalyst, and preparation method and application thereof

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Example Embodiment

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